function treeMenu(tName) {
var tMenu;
  tMenu = document.all[tName].style;
  if(tMenu.display == 'none') tMenu.display = "block";
  else tMenu.display = "none";
}

function chkMenu(tName,onoff) {
	var tMenu;
	if (document.getElementById) {
		tMenu = document.getElementById(tName).style;
	}else{
		tMenu = document.all[tName].style;
	}
  tMenu.display = onoff;
}